Casting car-wheel tires



(No Model.).

. N. WASHBURN.

CASTING GAR WHEEL TIRES. No. 248,241. Patented Oct. 11,1881.

247552265565. 1 a ]7ZV6.7ZZ,02.

UNITED STATES PATENT OFFICE.

NATHAN WASHBURN, OF ALLSTON, MASSACHUSETTS.

CASTING CAR-WHEEL TIRES.

SPECIFICATION forming part of Letters Patent lN'o. 248,241, dated October 11, 1881.

Application filed March 7, 1881. (No model.

To all whm it may concern Be it known that I, NATHAN WAsHBUEN, of Allston, in the county of Sufiolk and State of Massachusetts, have invented a certain new and useful Improvement Pertaining to Casting Oar-Wheel Tires, of which the following is a description, reference being had to the accompanying drawings, where- Figure 1 is a top view of amold for carrying ing my said invention into practice. Fig. 2 is a side view of same. Fig.3 is aview of oneside of same in vertical cross-section on plane was.

The parts of the mold shown in the drawings-which is for casting the tire for a car- Wheel-are mainly metallict'. 0., practically cast-iron.

The letter a denotes the base plate, which may well be annular. m

1) denotes an annular ring or casingforforming the periphery of the tire, sitting upon the base a.

0 denotes the matrix.

(1 denotes ring-sections for forming the inthrough radial runners l to the conduits j,

through which it enters at or near the bottom of the matrix and rises to fill the matrix, the

surplus rising in vents m forming sprues, af-

terward broken off.

The advantage of having molten metal enter at the bottom of mold matrices is well known. The problem solved by this invention was the devisingof apracticable modefor doing this in the casting of a tire or ring in a metallic mold; and the novelty consists (speaking now generally) in making the wedges of the ring-sections in two parts and having the conduit for the molten metal between them.

I claim as my invention In a mold for casting tires and rings, the wedges and wedge-backs g h, containing the conduits j, in combination with the interior ring-sections d, and with other suitable mold parts, substantially as shown and described.

NATHAN WASHBURN.

Witnesses: Y

W. E. SIMoNDs, JAMEs J. GREENE. 

